Hellenic Navwarns

There urgent pieces of information for the safety of navigation issued by the Hydrographic Service. NAVWARNS do not replace Notice nor other navigational aids. Being urgent information, they are not printed and are not distributed as Notice do, but they are transmitted via radiotelephony. For the main subject but also for the way of NAVWARNS transmission for Mariners detailed information can be found at Annual (Permanent) Notice No 1 and No 13.